T-stat?
07-01-2006, 07:09 AM
#1
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T-stat?
for past couple weeks, temp guage takes a few miles longer to rise to operating temp. yesterday it almost got there and then dropped to nearly the small cluster of marks. checked CC display and watched temp drop down to 73c. let car sit for 1 minute and guage came up to normal and CC read 86c. on way home last night, guage barely moved and CC read 61c max.
is this T-stat? is it cool I drive 40 miles round trip to get new stat and maybe 15 miles round trip before I put in new Tstat? dont have another car or time to fix till tommarrow morning
thanks
is this T-stat? is it cool I drive 40 miles round trip to get new stat and maybe 15 miles round trip before I put in new Tstat? dont have another car or time to fix till tommarrow morning
thanks
07-01-2006, 07:20 AM
#2
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sound like it
the car will be fine, especially now that it is warm outside, just get it fixed when you can. The thermostat was bad in my car when i got it (who knows how long it was bad) and i had to take a 4 hour trip the next day, the car runs fine, just never warms all the way up and will probably get a little worse gas mileage.
07-01-2006, 07:43 AM
#3
Thermostat replacement procedure (from memory)
Before you start:
PNs:
Thermostat - b 069 121 113 - 87 deg C (note: check action in hot water with a thermometer to make sure the new T-stat functions properly)
Seal = N 901 368 02 (might come with T-stat)
Cover (housing)(if cracked) = 074 121 121 B
Make sure it looks like the one on the left, not the V6 one on the right:
<center><img src="http://www.boost-instruments.com/ultrameta/tstat/tstat1.jpg"></center><p>
Now, the procedure:
1. Start car
2. Drive car onto ramps
3. Stop car, block rear wheels
4. Open hood, remove cap from coolant reservoir.
5. Go under car and remove belly pan if so equipped.
6. Locate rad drain plug (Bottom right side, blue X) and spigot
7. Connect hose onto drain plug spigot
8. Place bucket under hose and open blue X plug (turning counter-clockwise). Drain until bucket is full. Close plug (turning clockwise). Remove hose
9. Locate thermostat housing under intake manifold, near front of engine. (It might be difficult to see but it IS there, AND you can get at it without removing the PS pump)
10. Disconnect throttle body hose at throttle body and shove towards back of engine to get some room to work.
11. With whatever combination of stubby rachet, extension, universal joint, 10 mm socket or 10 mm wrench (check - this is from memory), loosen the two bolts holding the T-stat housing to the block.
12. Place bolts in a safe place and gently pry housing from the block. Shove housing and hose out of the way.
13. Note orientation of T-stat in block. Cross bar should be vertical as per 20vt90q's diagram:
<img src="http://pictureposter.audiworld.com/43547/t-stat.jpg">
14. Pry/pull T-stat out of block (don't worry about breaking it, its already broken).
15. Clean block area where T-stat lives with a rag to remove any debris.
16. Place new T-stat in block with cross-bar facing you and vertical. Air hole goes up.
17. Put new O-ring (seal) in T-stat housing and place housing in the correct position.
18. Start bolts by hand.
19. Tighten with combination of sockets, rachets and wrenches, as required. There isn't much room so try not to round the bolt heads off as you tighten.
20. Refill coolant reservoir with contents of drain bucket (or add new coolant - you may want to flush the system too - but that is an extra, not dealt with here). Leave reservoir cap off.
21. Reconnect throttle body hose (and any related wires you may have moved out of the way).
22. Start engine and look for leaks, run engine until thermostat opens (at around 87-89 deg.)
23. Look for leaks (watch the water is hot now).
24. Stop engine and replace belly pan (if so equipped).
25. Remove tools from engine bay and lower hood.
26. Remove blocks from rear tires.
27. Back car off ramps.
28. Clean up and crack beer.
29. Say "Ah..."
30. Anticipate next problem. Its an old S-car.
If I've forgotten anything, let me know and I will edit.
PNs:
Thermostat - b 069 121 113 - 87 deg C (note: check action in hot water with a thermometer to make sure the new T-stat functions properly)
Seal = N 901 368 02 (might come with T-stat)
Cover (housing)(if cracked) = 074 121 121 B
Make sure it looks like the one on the left, not the V6 one on the right:
<center><img src="http://www.boost-instruments.com/ultrameta/tstat/tstat1.jpg"></center><p>
Now, the procedure:
1. Start car
2. Drive car onto ramps
3. Stop car, block rear wheels
4. Open hood, remove cap from coolant reservoir.
5. Go under car and remove belly pan if so equipped.
6. Locate rad drain plug (Bottom right side, blue X) and spigot
7. Connect hose onto drain plug spigot
8. Place bucket under hose and open blue X plug (turning counter-clockwise). Drain until bucket is full. Close plug (turning clockwise). Remove hose
9. Locate thermostat housing under intake manifold, near front of engine. (It might be difficult to see but it IS there, AND you can get at it without removing the PS pump)
10. Disconnect throttle body hose at throttle body and shove towards back of engine to get some room to work.
11. With whatever combination of stubby rachet, extension, universal joint, 10 mm socket or 10 mm wrench (check - this is from memory), loosen the two bolts holding the T-stat housing to the block.
12. Place bolts in a safe place and gently pry housing from the block. Shove housing and hose out of the way.
13. Note orientation of T-stat in block. Cross bar should be vertical as per 20vt90q's diagram:
<img src="http://pictureposter.audiworld.com/43547/t-stat.jpg">
14. Pry/pull T-stat out of block (don't worry about breaking it, its already broken).
15. Clean block area where T-stat lives with a rag to remove any debris.
16. Place new T-stat in block with cross-bar facing you and vertical. Air hole goes up.
17. Put new O-ring (seal) in T-stat housing and place housing in the correct position.
18. Start bolts by hand.
19. Tighten with combination of sockets, rachets and wrenches, as required. There isn't much room so try not to round the bolt heads off as you tighten.
20. Refill coolant reservoir with contents of drain bucket (or add new coolant - you may want to flush the system too - but that is an extra, not dealt with here). Leave reservoir cap off.
21. Reconnect throttle body hose (and any related wires you may have moved out of the way).
22. Start engine and look for leaks, run engine until thermostat opens (at around 87-89 deg.)
23. Look for leaks (watch the water is hot now).
24. Stop engine and replace belly pan (if so equipped).
25. Remove tools from engine bay and lower hood.
26. Remove blocks from rear tires.
27. Back car off ramps.
28. Clean up and crack beer.
29. Say "Ah..."
30. Anticipate next problem. Its an old S-car.
If I've forgotten anything, let me know and I will edit.
Last edited by UrS4boy; 06-01-2009 at 05:50 AM.
07-01-2006, 12:24 PM
#7
Its in the tech resources section, under interior, or just follow the URL inside.
<ul><li><a href="https://www.audiworld.com/tech/int5.shtml">https://www.audiworld.com/tech/int5.shtml</a</li></ul>
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07-01-2006, 07:36 PM
#9
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Re: T-stat?
try coolant temp switch
http://www.autohausaz.com/search/productx.aspx?sid=ot4rka45r1xyawm10ediojye&mak eid=800002@Audi&modelid=1009347@S4%20&year =1993&cid=22@Fuel%20%26%20Air%20System&gid =4308@Coolant%20Temperature%20Switch<ul><li><a href="http://www.autohausaz.com/search/productx.aspx?sid=ot4rka45r1xyawm10ediojye&mak eid=800002@Audi&modelid=1009347@S4%20&year =1993&cid=22@Fuel%20%26%20Air%20System&gid =4308@Coolant%20Temperature%20Switch">http://www.a
http://www.autohausaz.com/search/productx.aspx?sid=ot4rka45r1xyawm10ediojye&mak eid=800002@Audi&modelid=1009347@S4%20&year =1993&cid=22@Fuel%20%26%20Air%20System&gid =4308@Coolant%20Temperature%20Switch<ul><li><a href="http://www.autohausaz.com/search/productx.aspx?sid=ot4rka45r1xyawm10ediojye&mak eid=800002@Audi&modelid=1009347@S4%20&year =1993&cid=22@Fuel%20%26%20Air%20System&gid =4308@Coolant%20Temperature%20Switch">http://www.a